JavaScript array loops

gistfile1.js

// With for..in
var stuff, key;
stuff = [];
stuff[0] = "zero";
stuff[9999] = "nine thousand nine hundred and ninety-nine";
stuff.name = "foo";

for (key in stuff){
	if (stuff.hasOwnProperty(key) && String(Number(key)) === key) {
		console.log("stuff[" + key + "] = " + stuff[key]);
	}
}

// With forEach (ECMAScript 5+)
var stuff;
stuff = [];
stuff[0] = "zero";
stuff[9999] = "nine thousand nine hundred and ninety-nine";
stuff.name = "foo";

stuff.forEach(function(value, key) {
	console.log("stuff[" + key + "] = " + value);
});


// Source: http://blog.niftysnippets.org/2010/11/myths-and-realities-of-forin.html